Acolyte of Sacrifice (3.5e Feat)
From D&D Wiki
 Acolyte of Sacrifice [Exalted]
Sacrifice your own hit points in order to heal your allies.
Benefit: A character with this feat can take damage up to her level to heal twice as much to a target creature, but she can’t take more damage that she has hit points left. She can spread this ability on several uses during the day. She can also take 2 Constitution damage to heal a target creature of the dazed, dazzled and fatigued status.